Abstract
Cognitive radio (CR) has been proposed as an effective technology for flexible use of the radio spectrum. The interference among primary users and CR users, however, becomes a critical problem when they are operating nearby using adjacent frequency channels with different transmission powers. In this paper, a CR-based bandwidth sharing architecture is proposed, which can effectively suppress adjacent channel interference (ACI) between them. This new approach is characterized by the adaptive frequency spreading, and the adaptive time spreading with power control for the subcarriers near the borders of the CR user’s spectrum. The frequency spreading scheme provides with extra power gain against ACI, whereas the time spreading with power control guarantees the minimal interference to primary users from CR users. By computer simulation, it has been proved that the proposed system outperforms the conventional OFDM systems in both throughput and BER performance.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
Mitola, J.: Cognitive Radio for Flexible Mobile Multimedia Communications. In: IEEE Int. Workshop on Mobile Multimedia Comm., pp. 3–10 (1999)
Weiss, T.A., Jondral, F.K.: Spectrum pooling: An Innovative Strategy for the Enhancement of Spectrum Effciency. IEEE Communications Magazine 42, 8–14 (2004)
Sahai, A., Hoven, N.: Power scaling for Cognitive Radio. IEEE WirelessCom (2005)
Sgrignoli, G.: DTV Repeater Emission Mask Analysis. IEEE Transaction on Broadcasting 48, 32–80 (2003)
Godlsmith, A.J., Shua, S.-G.: Variable-rate Variable-power MQAM for Fading Channels. IEEE Trans. Commun. 45 (1997)
Capar, F., Jondral, F.: Resource allocation in a Spectrum Pooling System for Packet Radio Networks Using OFDM/TDMA. IST Mobile and Wireless Telecom. (2002)
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 2007 Springer Berlin Heidelberg
About this paper
Cite this paper
Kim, MR., Kim, EJ., Kang, YJ., Kim, NM. (2007). Cognitive Radio Based Bandwidth Sharing Among Heterogeneous OFDM Access Systems. In: Boavida, F., Monteiro, E., Mascolo, S., Koucheryavy, Y. (eds) Wired/Wireless Internet Communications. WWIC 2007. Lecture Notes in Computer Science, vol 4517. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72697-5_31
Download citation
DOI: https://doi.org/10.1007/978-3-540-72697-5_31
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-72694-4
Online ISBN: 978-3-540-72697-5
eBook Packages: Computer ScienceComputer Science (R0)